This jungle-enshrouded site is arguably the most romantic and magical of all the ancient Mayan cities. Its exquisite architecture is set amid dense green jungle. The site requires a regular workforce, armed with machetes, to protect it from the constantly encroaching jungle. The awesome but graceful pyramids are crowned with temples that glow in the tropical sun. Small rivers criss-cross the site, and there are trails through unexcavated sections of the 4,400 acre reserve.